Collapse ART's AbstractMethod class into Executable

After the OpenJDK 8 pull there is now a common base class
for Method and Constructor that can be used instead.

Methods that are abstract on Executable but on Android
were implemented in AbstractMethod are now consistently
renamed to "{method}Internal", declared final and
given package-protected access.

For consistency with all other private, natively
implemented methods, the method getDeclaredAnnotations()
has been renamed getDeclaredAnnotationsNative().

Bug: 28666126
Bug: 31052885
Test: make test-art-host and cts run of CtsLibcoreTestCases
Change-Id: Ibfe6af6a47fe0cfffd0859ffbe58980aeb84e053
diff --git a/runtime/class_linker_test.cc b/runtime/class_linker_test.cc
index 5e0ee6f..65ce600 100644
--- a/runtime/class_linker_test.cc
+++ b/runtime/class_linker_test.cc
@@ -28,7 +28,6 @@
 #include "experimental_flags.h"
 #include "entrypoints/entrypoint_utils-inl.h"
 #include "gc/heap.h"
-#include "mirror/abstract_method.h"
 #include "mirror/accessible_object.h"
 #include "mirror/class-inl.h"
 #include "mirror/dex_cache.h"
@@ -697,24 +696,18 @@
 struct ExecutableOffsets : public CheckOffsets<mirror::Executable> {
   ExecutableOffsets() : CheckOffsets<mirror::Executable>(
       false, "Ljava/lang/reflect/Executable;") {
+    addOffset(OFFSETOF_MEMBER(mirror::Executable, access_flags_), "accessFlags");
+    addOffset(OFFSETOF_MEMBER(mirror::Executable, art_method_), "artMethod");
+    addOffset(OFFSETOF_MEMBER(mirror::Executable, declaring_class_), "declaringClass");
+    addOffset(OFFSETOF_MEMBER(mirror::Executable, declaring_class_of_overridden_method_),
+              "declaringClassOfOverriddenMethod");
+    addOffset(OFFSETOF_MEMBER(mirror::Executable, dex_method_index_), "dexMethodIndex");
     addOffset(OFFSETOF_MEMBER(mirror::Executable, has_real_parameter_data_),
               "hasRealParameterData");
     addOffset(OFFSETOF_MEMBER(mirror::Executable, parameters_), "parameters");
   };
 };
 
-struct AbstractMethodOffsets : public CheckOffsets<mirror::AbstractMethod> {
-  AbstractMethodOffsets() : CheckOffsets<mirror::AbstractMethod>(
-      false, "Ljava/lang/reflect/AbstractMethod;") {
-    addOffset(OFFSETOF_MEMBER(mirror::AbstractMethod, access_flags_), "accessFlags");
-    addOffset(OFFSETOF_MEMBER(mirror::AbstractMethod, art_method_), "artMethod");
-    addOffset(OFFSETOF_MEMBER(mirror::AbstractMethod, declaring_class_), "declaringClass");
-    addOffset(OFFSETOF_MEMBER(mirror::AbstractMethod, declaring_class_of_overridden_method_),
-              "declaringClassOfOverriddenMethod");
-    addOffset(OFFSETOF_MEMBER(mirror::AbstractMethod, dex_method_index_), "dexMethodIndex");
-  };
-};
-
 // C++ fields must exactly match the fields in the Java classes. If this fails,
 // reorder the fields in the C++ class. Managed class fields are ordered by
 // ClassLinker::LinkFields.
@@ -733,7 +726,6 @@
   EXPECT_TRUE(AccessibleObjectOffsets().Check());
   EXPECT_TRUE(FieldOffsets().Check());
   EXPECT_TRUE(ExecutableOffsets().Check());
-  EXPECT_TRUE(AbstractMethodOffsets().Check());
 }
 
 TEST_F(ClassLinkerTest, FindClassNonexistent) {